Swimming pool cover for low shelters with articulated roofing elements

ABSTRACT

The invention concerns a swimming pool cover consisting, over a portion (P′) at least of its length, of juxtaposed roofing elements (I′) whereof the distance which delimits the external chord of each of the longitudinal edges ( 220   a ′) and ( 220   b ′) resting on the support edge (S) of the pool and connected by two roof bows ( 210 ′) is shorter than the distance which delimits the internal chord of the two longitudinal edges ( 220   a ) and ( 220   b ) resting on the support edge (S) of the pool and connected by two roof bows ( 210 ) of the juxtaposed elements (I) of the other portion (P) of the roof to enable the first portion (P′) of small elements (I′) to be nested in the second portion (P) of large elements (I) thereby exposing partly the pool over a length corresponding to the displacement of the mobile portion (P′) of elements (I′).

FIELD OF APPLICATION OF THE INVENTION

[0001] The present invention relates to the field of low shelter swimming-pool roofing and, in particular, the adaptations making it possible to facilitate ease of opening of elements constituting the roofing.

DESCRIPTION OF PRIOR ART

[0002] Several types of roofing for swimming pools exist in prior art, but the present invention concerns, in particular, roofs that are generally called “low shelter”, comprising roof elements arranged juxtaposed along the length of the swimming pool and each able to perform a rotational movement on one of their longitudinal sides so as to be able to open up partly and thus give access to the water in the pool. For a better understanding of the invention, it should be noted that the longitudinal, transversal and lateral positions of the roof elements and/or their constitutive parts are considered relative to the longitudinal, lateral and transversal axes of the pool. Said roof elements are of the type each composing a cover formed of panels in translucent material such as double-walled polycarbonate and with a rigid frame, light and resistant to support the transparent cover, said frame being formed of arcs arranged in transversal planes and spaced by cross-ties with two longitudinal end cross-ties defining two longitudinal sides with the roof element. These two longitudinal sides rest on the edges of the pool defining a support surface for said roof elements. The support edges of these elements are usually constituted by the longitudinal edges of the pool.

[0003] In order to open this swimming pool partially and to profit from it in the fresh air, especially in mid-season as soon as the climate or temperature allows it, the roof elements of this swimming pool cover are partly opened individually in order to modulate the opening of the pool to the outside. In order to do this, at least one of the longitudinal sides of the frame of the roof elements is mounted articulated around a fixation lug anchored in the support edges of the pool in a transversal angular expansion plane, and the other side is intended to receive two struts with their heads penetrating each extremity of the side and their feet then resting on the support edges of the pool to block said struts between the edges of the pool and said roof element which is thus maintained in an inclined position relative to the ground, in the partly open position required. This maintenance device for a low shelter roof element in partly open position has disadvantages in that:

[0004] it limits opening up the pool to said partly open position,

[0005] for handling purposes, it requires the use of two struts as lever arms for each of the roof elements,

[0006] it often needs the intervention of two persons to lift each roof element,

[0007] it exposes said partly open elements to wind, that tends to destabilize them,

[0008] it takes a relatively long time to install when there are several elements,

[0009] etc.

[0010] Many improvements have been added in recent years to simplify the lifting operation for the roof elements using a sliding strut along the side acting as lever by applying a lifting effort at the middle of the side, or furthermore with the help of various lifting systems to reduce effort.

[0011] Despite these various innovations making significant improvements for moving the roof elements from a closed position to a partly open position, by avoiding the user having to make too much effort during this operation, the applicant has noted that the opening of the elements constituting swimming pool roofing remains a difficult handling operation, even though it has been simplified, because of the very fact of the weight of said elements. This handling even becomes a major problem when the swimming pool and thus the roof elements covering it are of large dimensions, or when it is necessary to lift several of them.

BRIEF DESCRIPTION OF THE INVENTION

[0012] Starting from this, the applicant has envisaged a new roofing concept for swimming pools, combining the advantages of low shelters with roof elements articulated along their longitudinal sides with those of high shelters with telescopic roof elements.

[0013] According to the invention, the swimming pool roofing for low shelters of the type where each constituent element is composed of a cover resting on a frame formed of two transversal arcs and separated by longitudinal cross-ties with two longitudinal parallel sides, with at least one of them mounted in an articulated way relative to the edge of the pool so that said element can move from a closed position to a partly open position, is notable in that the above-mentioned roofing is constituted, along at least one portion of its length, of juxtaposed roof elements whose distance defined by the external cord of the two longitudinal sides resting on the support edge of the pool and linking the two arcs is less than the distance defined by the internal cord of the two longitudinal sides resting on the support edge of the pool and connecting the two arcs of the juxtaposed elements of the other portion of the roofing to enable nesting of the so-called first portion of small elements in the so-called second portion of big elements and thus to partially open up the swimming pool along a length depending on the displacement of the mobile portion of elements.

[0014] This new concept of swimming pool roofing for low shelters is of great interest since it provides the double possibility of opening up the swimming pool either on one side or the other along the longitudinal plane of the pool by tilting the roof elements either from one side or from the other of the transversal plane of the swimming pool by displacement of one portion of elements into the other portion. Furthermore, the fact of associating several roof elements one behind the other in a mobile portion, makes it possible to have nesting in two widths only, thus limiting the dimensions on the support surface and even providing the possibility of making the whole roofing assembly rest on the curb of the swimming pool.

[0015] The applicant has envisaged several variants of this above-mentioned concept in its most elementary expression.

[0016] Thus, according to a first variant with two possibilities, either the portion with small roof elements is mounted so as to be mobile along and/or outside the swimming pool and is displaced beneath the portion of big roof elements to be partly or totally covered by the latter, or the inverse, where the portion with big roof elements is mounted in a mobile way along and/or outside the swimming pool and is displaced above the portion of small roof elements which it covers partly or totally.

[0017] According to another variant with two possibilities, when the roofing comprises a single mobile portion of roof elements, it will preferably be situated at one end of the swimming pool and, when the roofing comprises two mobile portions of elements, the latter will preferably be situated at the two ends of the swimming pool. In the first configuration, the mobile portion of elements is displaced from one end of the swimming pool which it opens up progressively towards the other end which remains closed and where the other portion of fixed elements is set, whereas in the second arrangement, the two mobile portions of elements are moved towards each other, progressively opening up the two ends of the swimming pool, and towards the middle of the latter which remains closed and where the central portion of fixed elements is to be found.

[0018] Even though the fundamental concepts of the invention have been described above, other details and characteristics of the invention will appear more clearly by reading the following description given as a non-limiting example and relative to the appended drawings, of an embodiment of a swimming pool roofing according to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019]FIG. 1 is an isometric view in perspective of a swimming pool roofing for low shelters, of standard design and shown in the closed position.

[0020]FIG. 2 is an isometric view in perspective of the roofing of the swimming pool of the drawing of FIG. 1, shown in partially opened position.

[0021]FIG. 3 is an isometric view in perspective of a roofing of a swimming pool according to the design of the invention and shown in closed position.

[0022]FIGS. 4, 5 and 6 are isometric views in perspective of the roofing of the swimming pool of the drawing of FIG. 3, shown in three positions for covering the pool.

[0023]FIG. 7 is an isometric view in perspective of the roofing of the swimming pool of the drawing of FIG. 3, showing two modes of opening the elements.

[0024]FIGS. 8a and 8 b are partial views in perspective of two adjoining arcs of two swimming pool roof elements of a same portion, shown in two different positions.

[0025]FIG. 9 is a partial view in vertical section of two swimming pool roof elements of a mobile portion and a non-mobile portion.

[0026]FIG. 10 is a partial view in vertical section of two other swimming pool roof elements of a mobile portion and a non-mobile portion.

[0027]FIG. 11 is a view from above of a mobile portion and a non-mobile portion of swimming pool roofing associated with a guide device between them.

[0028]FIG. 12 is a partial isometric view in perspective of the two portions of swimming pool roofing of the drawing of FIG. 11.

[0029]FIG. 13a is a partial view in vertical section of the two portions of swimming pool roofing of the drawing of FIG. 11.

[0030]FIG. 13b is a view following A of the drawing of FIG. 13a.

DETAILED DESCRIPTION OF THE DRAWINGS

[0031] The drawing in FIG. 1 shows a swimming pool roofing according to prior art, generally called low shelter and shown in closed position. This roofing, reference T in its assembly, is usually constituted of a series of roof elements I of the type each composing a cover formed of panels in translucent material 100 such as double-walled polycarbonate and a light and resistant rigid frame 200 in the form of arcs 210 arranged in transversal planes and separated by cross-ties 220 to support said cover. The two end cross-ties 220 of the frame define the two longitudinal sides 220 a and 220 b for the roof elements I which are retained on the longitudinal edges of the pool defining a support surface, by means of fixation lugs with references 300 a and 300 b respectively, anchored in a detachable manner in said edges S or in the curbs covering said edges.

[0032] As can be seen in the drawing of FIG. 2, one (the central) of the roof elements I is shown in partly open position, thus partially opening the swimming pool. In order to do this, one 220 a of the two longitudinal sides of the frame of this roof element is freed from its fixation lugs 300 a thus enabling said element I to follow a tilting movement towards its second side 220 b around the two fixation lugs 300 b, according to an angular expansion (represented by the arrow A) in a transversal plane of the pool. The element I is held in this partly open position by means of two separators formed by struts 400 whose heads 410 penetrate each end of the side 220 a and whose feet 420 are supported on the edge flanges S of the pool in which they become anchored in place of the fixation lugs 300 a that have been freed.

[0033] The drawing of FIG. 3 shows a swimming pool roofing with reference T′ as a whole and shown according to the original concept of the invention. Thus, it is constituted, at one of the ends (right side) of the swimming pool, of a portion P′ with three juxtaposed roof elements I′ whose distance defined by the external cord of the two longitudinal sides 220 a′ and 220 b′ resting on the support edge S of the pool and linking the two arcs 210′ of each element I′ is less than the distance defined by the internal cord of the two longitudinal sides 220 a and 220 b resting on the support edge S of the pool and connecting the two arcs 210 of each of the three juxtaposed elements I of the other portion P of the roofing T′ situated at the other end (left side) of the swimming pool, all three being of standard design just like the roofing T.

[0034] Advantageously, the two longitudinal sides 220 a′ and 220 b′ of the roof elements I′ of the portion P′ rest on the support edge of the pool S via displacement means (rolling) shown in the drawing of FIG. 9 or FIG. 10 allowing, once the fixation lugs 300 a′ and 300 b′ have been freed from their anchoring in the above-mentioned support edge S as shown in the drawing of FIG. 4, the portion P′ of elements I′ (arrow D) to be displaced towards the portion P of elements I, with nesting of the elements I′ inside the elements I. This evolution (arrow D) of the portion P′ from an intermediate position shown in FIG. 4 to a more nested position shown in FIG. 5, makes it possible to open up the pool of the swimming pool progressively at one end of the latter. The advantage of covering up the portion P′ by the portion P such as shown in the drawing of FIG. 5, is to have a swimming pool entirely covered at its left end and entirely open at its right end, arrangements that cannot be ensured by the articulated movements (arrow A of FIG. 2) of the elements I of the roofing T. It should be noted that the mobile portion P′ can be displaced along the support edge S but outside the pool of the swimming pool, as shown in the drawing of FIG. 6.

[0035] As can be seen in the drawing of FIG. 3, the tightly sealed link between the two portions P and P′ of the roofing T′ in its closed position is ensured by a partial mutual nesting of the two neighboring roof elements I and I′ with overlap of the end arcs 210 and 210′ of each of the nested elements. By installing a brush type joint in the usual way in the internal face of the end arc 210 of the roof element I of the portion P so that the latter remains in permanent contact with the subjacent end arc 210′ and/or with the panels 100′ of the cover of the mobile portion P′, the sealed link of the cover of the roofing T′ is guaranteed between the two portions P and P′ whatever the outer position of the latter, (see FIG. 3), partially nested (see FIG. 4) or totally nested (see FIG. 5).

[0036] The elements I′ of the mobile portion P′ comprise mutual linking means that are dissociable, on the one hand, to allow their free articulation (arrow A of FIG. 7) relative to the support edge S of the pool and non-dissociable on the other hand, to push in the direction of the arrow D but above all to bring back, in the reverse direction of the arrow D, the assembly of elements I′ stowed together such that it suffices to push and/or pull the portion P′ at any anchoring point whatsoever in order to displace the assembly of elements I′. Thus, when the linking means are dissociated as shown in FIG. 7, the elements I and I′ of the roofing T′ can provide the standard advantages of the low shelter of the roofing T by allowing the partly open position by the articulation A of said elements I and I′ on the support edge S of the pool and when the linking means are non-dissociated as shown in the drawing of FIG. 4, the elements I′ of the portion P′ enabling the open position by displacing said stowed elements I′ one after the other, along (FIGS. 4 and 5) and/or outside (FIG. 6) the edge of the pool.

[0037] According to a first preferred embodiment of the invention, the above-mentioned linkage means are constituted of wings of the arcs 210′ that, arranged overhanging the prolongation of the panels 100′ of the cover of translucent material to ensure partial sealed covering of the juxtaposed elements I′ of the roofing T′ in closed position, are provided with a removable device for solidarization with the arc 210′ of the adjacent element I′. This removable solidarization device (not shown) can be adapted by those skilled in the art, for example with a male-female assembly preformed respectively in the faces in contact with the wings and the arcs 210.

[0038] According to a second preferred embodiment of the invention, shown in more detail in the drawings of FIGS. 8a and 8 b, each of the above-mentioned means for linking two contiguous arcs with reference 210 r′ for the covered roof element and 210 c′ for the covering roof element (comprising the extended wings) of the mobile portion P′ is constituted of a U-profile 211′ which, intended to take the shapes of the rectangular lower profiles 212 r′ and 212 c′ of said two contiguous arcs, is made integral with the rectangular profile 212 r′ of the arc 210 r′ of the covered element in such a way that the rectangular profile 212 c′ of the arc 210 c′ of the covering element can be lodged and blocked in the U-shaped profile 211′ (see FIG. 8a) during the lowering movement of the covering element into its closed position and inversely, to release said U-shaped profile 211′ (see FIG. 8b) during the lifting movement of the same element to obtain a partly open position. Preferably, the upper part of the branch of the above-mentioned U-shaped profile 211′ not firmly attached to the arc 210 r′ of the covered element is flared to facilitate engaging the rectangular lower profile 212 c′ of the arc 210 c′ of the covering element with play, during its lowering movement into the closed position.

[0039] According to a further preferred embodiment of the invention, the arcs 210 of the roof elements I of the fixed portion P have the same radius of curvature as the arcs 210′ of the roof elements I′ of the mobile portion P′. Thus, with the same arcs and even the same elements I it is possible to produce either fixed elements I or mobile elements I′. In order to respect the concept of the invention which consists, at the level of their bearing on the support edge S, in differentiating the distance defined by the external cord of the two longitudinal sides 220 a′ and 220 b′ of the juxtaposed elements I′ of the mobile portion P′, from the distance defined by the internal cord of the two longitudinal sides 220 a and 220 b of the juxtaposed elements I of the other portion P, the applicant has envisaged profiling the two longitudinal sides 220 a, 220 b and 220 a′, 220 b′ of the roof elements I and I′ so as to receive in a removable and/or adjustable manner, either the fixation lugs 300 a of said elements I on the support edge S, or the displacement means 320 a′ of said elements I′ along said edge.

[0040] As can be seen on the drawing of FIG. 9, illustrating a first form of embodiment of the invention, the longitudinal side 220 a of the element I has the same profile as that of the longitudinal side 220 a′ of the element I′ such that when engaging the fixation means 310 a in the side 220 a, to be associated with the lugs 300 a, and in the side 220 a′ the rolling means 320 a′ ensuring the displacement of the element I′ it is possible, through the raised and offset configuration of the fixations means 310 a, to lift the element I relative to the element I′ while increasing the bearing cord at ground level of the element I to ensure that there is no rubbing between the two elements I and I′ and free mobility of the latter (I′) inside the former (I).

[0041] It is to be noted that the longitudinal sides 220 a, 220 b and 220 a′, 220 b′ are preformed to receive the fixation means 310 a and the rolling means 320 a′, around axes parallel to the longitudinal axis of the pool, in such a way as to adapt to the different radii of the curvature of the arcs in function of the width of the pools. Therefore, whatsoever the curvature of the arcs, it will be possible to use the same fixation means 310 a and rolling means 320 a′, then suitably placed by adjusting the angle of inclination correctly following the profile of the longitudinal sides.

[0042] According to a second form of embodiment of the invention, shown in the drawing of FIG. 10, the longitudinal side 220 a (shown in thick lines) of the element I of the portion P does not have the same profile as that of the longitudinal side 220 a′, of the element I′ (shown in fine lines) of the mobile portion P′. Thus, the longitudinal cross-tie 220 a′ of the mobile element is set at its upper part in the usual way and facing towards the internal side of the roofing with a projecting inclined groove 221 a′ to grab and retain the edge of the panel 100′ (shown in a line of dots and dashes), and at its lower part and facing towards the external side of the roofing, with a coupling organ 222 a′ in order to retain, via the fixation lugs 300 a′ (shown in a line of dots and dashes) said element I′ on the edge of the pool S. The coupling organ 222 a′ shown is of the type formed following the profile of the cross-tie of the side 220 a′ along a runner of circular cross-section open to the exterior of a longitudinal groove 222 a′′ with a bigger width than that of the thickness of the fixation lugs 300 a′ in order to enable a pivoting linkage between the side 220 a′ and the fixation lug 300 a′, and therefore free articulation (arrow A of FIG. 7) of the roof element I′ associated with it. According to the invention, the rolling organs, only one of which (320 a′) is shown, ensure free movement of the side 220 a′ along the edge S, and therefore the entire associated assembly of the element T′.

[0043] The end cross-tie 220 a of the portion P is preformed differently from that of the standard cross-tie 220 a′ by adopting a profile that is preferably hollow and bent with two branches 220 a 1 and 220 a 2 with an obtuse angle making it possible to ensure simultaneously both a′ lateral displacement towards the external side of the roofing from the position of the coupling organ 222 a, and a vertical displacement upwards, from the position of the inclined groove 221 a while still respecting the angle of inclination of the latter. The first branch 220 a 1 of said elbow-shaped profile forming the longitudinal side 220 a and receiving at its low part the coupling organ 222 a is narrow and set vertically like a post with an inclination closely adapted to the radius of curvature of the panels, and the second branch 220 a 2 receiving at its top part the inclined groove 221 a, takes the shape of a cone with its small base being along the prolongation of the first vertical branch 220 a 1 while the big base receives at its top part the above-mentioned inclined groove 221 a. By simply replacing the profile of the longitudinal sides 220 a′ and 220 b′ of the element I′ by that of the longitudinal sides 220 a and 220 b such as shown in the drawing of FIG. 10, an element I is obtained that ensures, because of the presence of the cone of the second branch 220 a 2, an increase in the distance defined by the external cord of the two longitudinal sides 220 a′ and 220 b′ and therefore the spacing (only one of which is shown, 222 a) as well as, because of the presence of the post forming the first branch 220 a 1, the raising of the height of the inclined grooves (only one of which is shown, 221 a). This increase of distance between the coupling organs and this raising of the grooves will be parameterized at the level of the sides of the cone of the second branch 220 a 2 and those of the post of the first branch 220 a 1 to allow, without rubbing, free mobility of the juxtaposed elements I′ of the mobile portion P′ below the juxtaposed elements I of the other portion P.

[0044] In order to allow easy release of the fixation lugs 300 a from the coupling organs 222 a′, especially when different elements I′ are coupled together by U-shaped profiles 211′, it is envisaged to truncate the cylindrical end 301 a′ of the fixation lugs 300 a′ along an oblique plane parallel to the longitudinal axis of the side 220 a′ so as to enable passage of the truncated cylindrical end 301 a′ of the fixation lug 300 a′ by opening the longitudinal groove 222 a″. In fact, once the fixation lug 300 a′ is separated from its securement on the edge S of the pool, it suffices to tilt it upwards to disengage it from the runner of the coupling organ 222 a.

[0045] In order to correct the significant lateral misalignments of the mobile portion P′, during its displacements D inside the fixed portion P along the longitudinal axis of the swimming pool, the applicant has also envisaged installing a guide device 500 shown in the drawing of FIG. 11 and original in that it comprises:

[0046] on the one hand, at least one but preferably two guide rollers 510 a′ and 510 b′ engaged in free rotation around two vertical axes associated with the end arc 210′ of the mobile portion P′ extending along the fixed portion P and at the level of the two longitudinal sides 220 a′ and 220 b′ of the mobile portion P′, in such a way that the rolling strips 511 a′ and 511 b′ of said guide rollers 510 a′ and 510 b′ overhang the longitudinal sides 220 a′ and 220 b′ facing the two longitudinal sides 220 a and 220 b of the fixed portion P while still being supported on the cross-ties formed by said longitudinal sides 220 a and 220 b or on the panels (100) forming a runway along the length of displacement of said mobile portion P′.

[0047] and on the other hand, at least one but preferably two counter-guide rollers 520 a and 520 b engaged in free rotation around two vertical axes associated with the end arc 210 of the fixed portion P along which the mobile portion P′ moves and at the level of the two longitudinal sides 220 a and 220 b in such a way that the rolling strips 521 a and 521 b of said counter-guide rollers 520 a and 520 b overhang the vertical plane of the longitudinal sides 220 a and 220 b facing the two longitudinal sides 220 a′ and 220 b′ of the mobile portion P′ while still being supported on the cross-ties formed by said longitudinal sides 220 a′ and 220 b′ or on the panels 100′ of the mobile portion P′ forming a runway along the length of displacement of the latter. Preferably, the axes of the two counter-guide rollers 520 a and 520 b are maintained at the level of the end arc of the fixed portion P, in a vertical position, by means of a fixation in the longitudinal edge S of the swimming pool.

[0048] The drawing of FIG. 12 shows in more detail one (510 a′) of the two guide rollers engaged in free rotation around a vertical axis associated with the end arc 210′ at the level of the longitudinal side 220 a′ of the mobile portion P′ and one (520 a) of the two counter-guide rollers engaged in free rotation around a vertical axis associated with the end arc 210 at the level of the longitudinal side 220 a. More precisely, as can be seen in the drawings of FIGS. 13a and 13 b, the rolling strip 511 a′ of said guide roller 510 a′ overhangs the plane of the longitudinal side 220 a′ while still being supported on the internal wall of the narrow vertical part forming post 220 a 1 of the longitudinal side 220 a of the fixed portion P, and the rolling strip 521 a of said counter-guide roller 520 a overhangs the plane of the longitudinal side 220 a while still being supported by the external wall of the longitudinal side 220 a′ of the mobile portion P′.

[0049] The pair of guide rollers 510 a′ and 510 b′ associated with the pair of counter-guide rollers 520 a and 520 b forming the guiding device 500 have the great advantage of being able to automatically adjust the lateral misalignments of displacements D of the mobile portion P′ relative to the fixed portion P. Furthermore, when the two guide rollers 510 a′ and 510 b′ engaged in rotation around two associated axes of the end arc 210′ of the mobile portion P′ are partially set (as shown in the drawing of FIG. 13) or totally set in the same horizontal plane, they arrive at a stop at the end of the run against the two counter-guide rollers 520 a and 520 b engaged in rotation around two vertical axes associated with the end arc of the fixed portion P, in such a way as to limit the linear displacement runs D of said mobile portion P′ along the longitudinal axis of the swimming pool.

[0050] It is evident that that the device 500 can be modified following several adaptations while still remaining within the context of the present invention, adaptations consisting, for example:

[0051] of adopting the same principle when the portion P is mobile and covers the fixed portion P′,

[0052] of not limiting the number of rollers when the swimming pool elements have greater dimensions,

[0053] of envisaging other guide rollers or counter-guide rollers set along the length of the end arcs, for example in such a way as to bear on the cross-ties 220 and/or the panels 100 of the other portion P,

[0054] of motorizing at least the guide and counter-guide rollers in order to control the displacements D of the mobile portion,

[0055] of setting the axes of the guide rollers 220 a′ and 220 b′ along a significantly inclined axis relative to the vertical in such a way that the rolling strips 511 a′ and 511 b′ of said guide rollers bear on the longitudinal sides 220 a and 220 b of the fixed portion while still ensuring guiding, the bearing of the mobile portion P′ thus replacing or substituting the above-mentioned rolling means 320 a′ allowing displacements D.

[0056] It is understood that the swimming pool roofing T described and shown above, is presented as a divulgation and not as a limitation. Evidently, various arrangements, modifications and improvements can be added to the above example, without in any way extending beyond the framework of the invention taken in its widest aspects and meaning. 

1-27. (Cancelled)
 28. A swimming pool roofing for low shelters constituted by roof elements (I and I′) juxtaposed along a length of a swimming pool comprising: a translucent material cover (100 and 100′) and a resistant rigid frame formed of at least two arcs (210 and 210′) arranged in transverse planes and separated by longitudinal cross-ties (220 and 220′) with two end cross-ties delimiting two longitudinal parallel sides (220 a, 220 a′ and 220 b, 220 b′) to the roof elements (I and I′) and which rest on longitudinal edges of the pool, thereby defining a support surface (S), said roof elements (I and I′) having at least one longitudinal side (220 b) articulated (arrow A) relative to the support surface (S) of the edge of the pool, said articulation allowing said element to pivot from a closed position to a partly open position, wherein said roofing is constituted, along at least one portion (P′) of its length, of juxtaposed roof elements (I′) whose distance, defined by an external cord of the two longitudinal sides (220 a and 220 b′) resting on the support edge (S) of the pool and linking the two arcs (210′), is less than the distance defined by an internal cord of the two longitudinal sides (220 a and 220 b) resting on the support edge (S) of the pool and connecting the two arcs (210) of the juxtaposed elements (I) of the other portion (P) of the roofing to enable nesting of a first portion (P′) of small elements (I′) in a second portion (P) of big elements (I) and thus to partially open up the swimming pool along a length depending on a displacement of the mobile portion (P′) of elements (I′), and wherein the roofing (I′) of the mobile portion (P′) comprises mutual linking means that are: dissociable to allow their free articulation (arrow A) of each element (I′) relative to the support edge (S) of the pool, and non-dissociable to allow movement which pushes or pulls along said support edge (S), the assembly of elements (I′) which are mobile, juxtaposed and stowed one after the other.
 29. The swimming pool roofing according to claim 28, wherein the portion (P′) with small roof elements (I′) is mounted so as to be mobile (arrow D) along or outside of the swimming pool, and is displaced beneath the portion (P) of big roof elements (I) to be partly or totally covered by said big roof elements (I).
 30. The swimming pool roofing according to claim 28, wherein the portion (P) with big roof elements (I) is mounted so as to be mobile along or outside of the swimming pool, and is displaced above the portion (P′) of small roof elements (I′) which it covers partly or totally.
 31. The swimming pool roofing according to claim 28, wherein the mobile portion (P′) of roof elements (I′) is situated at one end of the swimming pool.
 32. The swimming pool roofing according to claim 28, wherein the roofing comprises two mobile portions of elements situated at the two ends of the swimming pool.
 33. The swimming pool roofing according to claim 28, wherein the link between the two portions (P and P′) of the roofing elements (I and I′) in the closed position is ensured by a partial mutual nesting of the two neighboring roof elements (I and I′) with overlap of the end arcs (210 and 210′) of each of the nested elements (I and I′).
 34. The swimming pool roofing according to claim 28, wherein the arcs (210 and 210′) of the roof elements (I and I′) of the fixed portion (P) and mobile portion (P′) have a same radius of curvature.
 35. The swimming pool roofing according to claim 28, wherein the longitudinal side (220 a, 220 b and 220 a′, 220 b′) of the roofing element (I and I′) of the fixed portion (P) and mobile portion (P′) are profiled to receive in a removable or adjustable manner, either fixation lugs (310 a) of said elements (I) on the support edge (S), or displacement means (320 a′) of said elements (I′) along and outside of said support edge (S).
 36. The swimming pool roofing according to claim 28, wherein linking means comprise wings of the arcs (210′) that, arranged overhanging the prolongation of the panels (100) of the translucent material cover to partially seal the covering of the juxtaposed elements (I′) of the roofing in the closed position, are provided with a removable device for solidarization the wings with the arc (210′) of the adjacent element (I′).
 37. The swimming pool roofing according to claim 36, wherein each means for linking two contiguous arcs, (210 r′) for the covered roof element and (210 c′) for the covering roof element of the mobile portion (P′), comprises a U-profile (211′) which, taking shapes of rectangular lower profiles (212 r′ and 212 c′) of said two contiguous arcs (210 r′ and 210 c′), is made integral with the rectangular profile (212 r′) of the arc (210 r′) of the covered element in such a way that the rectangular profile (212 c′) of the arc (210 c′) of the covering element can be lodged in the U-shaped profile (211′) during the lowering movement of the covering element into the closed position and inversely, to release said U-shaped profile (211′) during the lifting movement of the same element to obtain an open -position.
 38. The swimming pool roofing according to claim 37, wherein an upper part of a branch of the U-shaped profile (211′) not firmly attached to the arc (210 r′) of the covered element is flared to facilitate engaging the rectangular lower profile (212 c′) of the arc (210 c′) of the covering element with play, during its lowering movement into the closed position.
 39. The swimming pool roofing according to claim 28, wherein the two end cross-ties of the frame delimiting two longitudinal sides (220 a, 220 a′ and 220 b, 220 b′) to the roof element (I and I′) are each arranged at their upper part and facing towards the internal side of the roofing with a projecting inclined groove (221 a and 221 a′) to grab and retain the edge of the translucent material cover (100 and 100′) at their lower part and facing towards the external side of the roofing, with a coupling organ (222 a and 222 a′) in order to retain, via fixation lugs (300 a, 300 a′ and 300 b, 300 b′) of said elements (I and I′) on the edge of the pool (S), wherein each of two end cross-tie (220 a) of the portion (P) of the big roofing elements (I) receiving the coupling organ (222 a) and the groove (221 a) is preformed with a profile bent with two branches (220 a 1 and 220 a 2) with an obtuse angle to ensure simultaneously both a lateral displacement towards the external side of the roofing from the position of the coupling organ (222 a), and the vertical displacement upwards, from the position of the inclined groove (221 a), while still respecting the angle of inclination of the inclined groove (221 a).
 40. The swimming pool roofing according to claim 39, wherein the first branch (220 al) of said profile forming the end cross-tie (220 a) and receiving at its low part the coupling organ (222 a) is narrow and set vertically like a post, and wherein a second branch (220 a 2) receiving at its top part the inclined groove (221 a), takes the shape of a cone with its small base along the prolongation of the first vertical branch (220 al) while a big base receives at its top part the inclined groove (221 a).
 41. The swimming pool roofing according to claim 39, wherein the coupling organ (222 a′) of the longitudinal sides (220 a′) is formed following the profile of the cross-tie of the longitudinal sides (220 a′) along a runner of circular cross-section open to the exterior of a longitudinal groove (222 a′) with a bigger width than that of the thickness of the fixation lugs (300 a′) in order to enable a pivoting linkage between the longitudinal sides (220 a′) and a cylindrical end (301 a′) of the fixation lugs (300 a′), wherein said cylindrical end (301 a′) of the fixation lug (300 a′) is truncated along an oblique plane parallel to the longitudinal axis of the longitudinal sides (220 a′) so as to enable passage of said truncated cylindrical end (301 a′) of the fixation lug (300 a′) by the longitudinal groove (222 a′) of said coupling organ (222 a′).
 42. The swimming pool roofing according to claim 28, in which either a portion (P′) of small roofing elements (I′) or a portion (P) of big roofing elements (I) is mounted mobile (arrow D) along the swimming pool, wherein the displacements (D) of said mobile portion (P′) are guided along the longitudinal axis of the swimming pool by at least one guide roller (510 a′ or 510 b′) engaged in rotation around a vertical axis associated with the end arc (210′) of the mobile portion (P′) such that the rolling strip (511 a′) of said guide roller (510 a′) overhang the plane of mobile portion (P′) facing the fixed portion (P) while still being supported on the cross-ties (220) or on the panels (100) of said fixed portion (P) forming a runway along the length of displacement of said mobile portion (P′).
 43. The swimming pool roofing according to claim 42, wherein the displacements (D) of said mobile portion (P′) are guided (arrow D) along the longitudinal axis of the swimming pool by two guide rollers (510 a′ and 510 b′) engaged in rotation around two axes associated with the end arc (210′) of the mobile portion (P′) at the level of the two longitudinal sides (220 a′ and 220 b′), in such a way that the rolling strips (511 a′ and 511 b′) of said guide rollers (510 a′ and 510 b′) overhang the plane of the longitudinal sides (220 a′ and 220 b′) of the mobile portion (P′) facing the two longitudinal sides (220 a and 220 b) of the fixed portion (P) while still being supported on said two longitudinal sides (220 a and 220 b) of the fixed portion (P) forming a runway along the length of displacement of said mobile portion (P′).
 44. The swimming pool roofing according to claim 42, wherein said guide rollers (510 a′ and 510 b′) are arranged with the end arc (210′) of the mobile portion (P′) moving along the fixed portion (P).
 45. The swimming pool roofing according to claim 42, wherein the axes of said two guide rollers (510 a′ and 510 b′) are arranged in vertical planes.
 46. The swimming pool roofing according to claim 42, wherein the axes of said guide rollers (510 a′ and 510 b′) are arranged in inclined planes such that guiding, bearing and displacement (arrow D) of the mobile portion (P′) is ensured.
 47. The swimming pool roofing according to claim 28, in which either the portion (P′) of small roofing elements (I′) or the portion (P) of big roofing elements (I) is mounted mobile (arrow D) along the swimming pool, wherein the displacements D of said mobile portion (P′) are guided along the longitudinal axis of the swimming pool by at least one counter guide roller (520 a or 520 b) engaged in rotation around an axis associated with the end arc (210) of the fixed portion (P′) around a vertical axis associated with the end arc (210′) of the mobile portion (P′) such that the rolling strip (521 a or 521 b) of said counter-guide roller (520 a or 520 b) overhang the plane of fixed portion (P) facing the mobile portion (P′) while still being supported on the cross-ties (220′) or on the panels (100′) of said mobile portion (P′) forming a runway along the length of displacement of the panels (100′).
 48. The swimming pool roofing according to claim 47, wherein the displacements (D) of said mobile portion (P′) are guided (arrow D) along the longitudinal axis of the swimming pool by two counter-guide rollers (520 a and 520 b) engaged in rotation around two axes associated with the end arc (210) of the fixed portion (P) at the level of the two longitudinal sides (220 a and 220 b), in such a way that the rolling strips (521 a and 521 b) of said counter-guide rollers (520 a and 520 b) overhang the plane of the longitudinal sides (220 a and 220 b) of the fixed portion (P) facing the two longitudinal sides (220 a′ and 220 b′) of the mobile portion (P′) while still being supported on said two longitudinal sides (220 a′ and 220 b′) of the mobile portion (P′) forming a runway along the length of displacement of that latter.
 49. The swimming pool roofing according to claim 47, wherein the counter-guide rollers (520 a and 520 b) are arranged with the end arc (210) of the fixed portion (P or P′) along which the mobile portion (P′ or P) moves.
 50. The swimming pool roofing according to claim 47, wherein the axes of said two counter-guide rollers (520 a and 520 b) are arranged, at the level of the end arc (210) of the fixed portion (P) along which the mobile portion (P′) moves, in a vertical plane by means of a fixation in the longitudinal edges (S) of the swimming pool.
 51. The swimming pool roofing according to claim 42, wherein the guide rollers (510 a′ or 510 b′) or the counter-guide rollers (520 a and 520 b) are engaged in free rotation around their axes.
 52. The swimming pool roofing according to claim 42, wherein at least one of the guide rollers (510 a′ or 510 b′) or of the counter-guide rollers (520 a and 520 b) is motorized.
 53. The swimming pool roofing according to claim 42, wherein the displacements (D) of said mobile portion (P′) are guided (arrow D) along the longitudinal axis of the swimming pool: by two guide rollers (510 a′ and 510 b′) engaged in free rotation around two vertical axes associated with the end arc (210′) of the mobile portion (P′) extending along the fixed portion (P) and at the level of the two longitudinal sides (220 a′ and 220 b′), such that the rolling strips (511 a′ and 511 b′) of said guide rollers (510 a′ and 510 b′) overhang the plane of the longitudinal sides (220 a′ and 220 b′) facing the two longitudinal sides (220 a and 220 b) of the fixed portion (P) while still being supported on the cross-ties formed by said longitudinal sides (220 a and 220 b) forming a runway along the length of displacement of said mobile portion (P′), or by two counter-guide rollers (520 a and 520 b) engaged in free rotation around two vertical axes associated with the end arc (210) of the fixed portion (P) along which the mobile portion (P′) moves and at the level of the two longitudinal sides (220 a and 220 b) in such a way that the rolling strips (521 a and 521 b) of said counter-guide rollers (520 a and 520 b) overhang the plane of the longitudinal sides (220 a and 220 b) of the fixed portion (P) facing the two longitudinal sides (220 a′ and 220 b′) of the mobile portion (P′) while still being supported on said two longitudinal sides (220 a′ and 220 b′) of the mobile portion P′ forming a runway along the length of displacement of the latter.
 54. The swimming pool roofing according to claim 53, wherein the two guide rollers (510 a′ and 510 b′) engaged in rotation around two associated axes of the end arc (210′) of the mobile portion (P′) moving along the fixed portion (P) are partially set or totally set in the same horizontal plane as the plane of the two counter-guide rollers (520 a and 520 b) engaged in rotation around two vertical axes associated with the end arc (210) of the fixed portion (P) along which the mobile portion (P′) moves, in such a way as to arrive at a stop at the end of the run against that latter and in such a way as to limit the end linear displacement runs D of said mobile portion P′ along the longitudinal axis of the swimming pool. 